More information to the container guide
More information to the container guide

Closes #13569

stianst/keycloak,keycloak/keycloak,srose/keycloak,mhajas/keycloak,hmlnarik/keycloak,mhajas/keycloak,stianst/keycloak,reneploetz/keycloak,raehalme/keycloak,jpkrohling/keycloak,raehalme/keycloak,raehalme/keycloak,jpkrohling/keycloak,keycloak/keycloak,abstractj/keycloak,stianst/keycloak,stianst/keycloak,abstractj/keycloak,reneploetz/keycloak,srose/keycloak,abstractj/keycloak,srose/keycloak,hmlnarik/keycloak,mhajas/keycloak,stianst/keycloak,hmlnarik/keycloak,abstractj/keycloak,jpkrohling/keycloak,mhajas/keycloak,reneploetz/keycloak,jpkrohling/keycloak,reneploetz/keycloak,mhajas/keycloak,srose/keycloak,keycloak/keycloak,keycloak/keycloak,abstractj/keycloak,raehalme/keycloak,hmlnarik/keycloak,raehalme/keycloak,reneploetz/keycloak,hmlnarik/keycloak,jpkrohling/keycloak,keycloak/keycloak,hmlnarik/keycloak,raehalme/keycloak,srose/keycloak